Drug interactions
Dexamethasone-tobramycin + Gefitinib
Severity: Moderate
Dexamethasone-tobramycin and Gefitinib: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Dexamethasone is a CYP3A4 inducer and may reduce gefitinib exposure, potentially lowering antitumor efficacy. The effect is more relevant with sustained systemic dexamethasone than with ophthalmic use.
What this interaction means in plain words
Dexamethasone-tobramycin and Gefitinib can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Dexamethasone-tobramycin belongs to Anti Bacterial; Gefitinib belongs to Oncology.
Why it happens
Dexamethasone induces CYP3A4, increasing gefitinib metabolism.
What to do
With prolonged systemic dexamethasone, monitor tumor response and consider gefitinib dose adjustment per labeling for CYP3A4 inducers.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Dexamethasone-tobramycin
Other interactions of Gefitinib
Frequently asked questions
Can I take Dexamethasone-tobramycin with Gefitinib?
MediHelp rates the interaction as moderate. Dexamethasone-tobramycin and Gefitinib can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Dexamethasone is a CYP3A4 inducer and may reduce gefitinib exposure, potentially lowering antitumor efficacy. The effect is more relevant with sustained systemic dexamethasone than with ophthalmic use.
How serious is the interaction between Dexamethasone-tobramycin and Gefitinib?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: With prolonged systemic dexamethasone, monitor tumor response and consider gefitinib dose adjustment per labeling for CYP3A4 inducers.
What other medicines interact with Dexamethasone-tobramycin?
MediHelp also lists interactions of Dexamethasone-tobramycin with, for example, Capreomycin, Carboplatin, Ciprofloxacin. The full list is on the Dexamethasone-tobramycin page.
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